#!/usr/bin/env node 
var pi=Math.PI;
var circle=function(radius){
  this.diameter=function(){
    return 2*radius; 
  }
  this.circumference=function(){
    return pi*2*radius;
  }
  this.area=function(){
    return pi*radius*radius;
  }
}
console.log('\n05-export-object.js\n',module);
module.exports=circle;
